(2) Cover. Except for filings by unrepresented parties, the cover of the appellant's brief must be blue; the appellee's, red; an intervenor's or amicus curiae's, green; and any reply brief, gray; and any supplemental brief, tan. The front cover of a brief must contain:

(3) Binding. The brief must be bound in any manner that is secure, does not obscure the text, and permits the brief to lie reasonably flat when open.

(4) Paper Size, Line Spacing, and Margins. The brief must be on 8 ½ by 11 inch paper. The text must be double-spaced, but quotations more than two lines long may be indented and single-spaced. Headings and footnotes may be single-spaced. Margins must be at least one inch on all four sides. Page numbers may be placed in the margins, but no text may appear there.

(5) Typeface. Either a proportionally spaced or a monospaced face may be used.

(2) Other Papers. Any other paper, including a petition for panel rehearing and a petition for hearing or rehearing en banc, and any response to such a petition, must be reproduced in the manner prescribed by Rule 32(a), with the following exceptions:

(d) Signature. Every brief, motion, or other paper filed with the court must be signed by the party filing the paper or, if the party is represented, by one of the party's attorneys.

(e) Local Variation. Every court of appeals must accept documents that comply with the form requirements of this rule. By local rule or order in a particular case a court of appeals may accept documents that do not meet all of the form requirements of this rule.